Automatic calibration method for engine misfire detection system

Active Publication Date: 2005-12-27
FCA US
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Benefits of technology

[0005]The present invention provides a method for calibrating an engine misfire detection system for an internal combustion engine. More particularly, the present invention provides a method of collecting a plurality of groups of sample data points. Each of the groups of sample data points represents a cylinder firing event. Optionally, misfire events can be induced during the collection of the groups of sample

Problems solved by technology

Automobile engine misfires increase the amount of unburned combustion byproducts passing through the catalytic converter.
Engine misfire occurs as a result of the absence of spark in a cylinder, poor fuel metering, poor compression, or other similar conditions.
Over time, regular engine misfire can lead to damage of

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  • Automatic calibration method for engine misfire detection system
  • Automatic calibration method for engine misfire detection system
  • Automatic calibration method for engine misfire detection system

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Example

[0031]The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

[0032]Referring now to the FIG. 1, a block diagram of the engine system, in which the misfire detection system calibrated by the system of the present invention is implemented, is shown generally at 10. The system 10 includes an internal combustion spark ignited engine 12, shown in partial cross-section, which is of the type implemented in a conventional motor vehicle (not shown). The engine contains a plurality of cylinders, represented by the cylinder 14, with each of the cylinders having a piston, represented by the piston 16, operatively disposed therein. Each of the pistons is connected by a connecting rod 18 to a crankshaft 20. A conventional engine cam shaft 22 is also operatively located within the engine for opening and closing intake and exhaust valves, such as the intake valve 24, associated with the cylind...

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Abstract

The present invention provides a method and system for systematically calibrating an engine misfire detection system for an internal combustion engine. The present invention provides a method of collecting a plurality of groups of sample data points. Each of the groups of sample data points represents a cylinder firing event. Optionally, misfire events can be induced during the collection of the groups of sample data points. Using the collected data points, a plurality of compensation parameters is then generated and applied iteratively to the sample data points to generally optimize the detection of misfire occurrences. Compensation parameters that produce a high accuracy misfire detection are selected and can be exported from the calibration system to transport to an engine controller in an internal combustion engine. Compensation of edge-to-edge error in engine speed data, engine noise, misfire signal magnitude, and filtering zone boundary coefficients enhance signal quality and further enhance misfire detection.

Description

FIELD OF THE INVENTION[0001]The present invention relates generally to internal combustion engines and, more particularly, to a method for calibration an automobile engine misfire detection system.BACKGROUND OF THE INVENTION[0002]Automobile engine misfires increase the amount of unburned combustion byproducts passing through the catalytic converter. Engine misfire occurs as a result of the absence of spark in a cylinder, poor fuel metering, poor compression, or other similar conditions. Over time, regular engine misfire can lead to damage of the catalytic converter and, consequently, increased amounts of unburned byproducts being admitted into the atmosphere.[0003]Many motor vehicles with fuel feedback control systems are equipped with an emission malfunction indicator that identifies a misfiring engine and the particular malfunctioning component or components. Thus, upon the malfunction indicator being activated, the vehicle operator could proceed to a qualified vehicle repair cent...

Claims

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Application Information

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IPC IPC(8): F02D35/02F02D41/24G01M15/00G01M15/11
CPCG01M15/11F02D41/1498F02D41/28F02D41/2432F02D2041/281G01D18/002G01M15/00
Inventor WU, ZHIJIAN JAMESHAN, MINLEE, ANSON
Owner FCA US
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